Pi-acid ligands in iron(III) porphyrinates. Characterization of low-spin bis(tert-butylisocyanide)(porphyrinato)iron(III) complexes having (d(sub xz),d(sub yz))(super 4)(d(sub xy))(super 1) ground states

Isocyanide complexes of (porphyrinato)iron(III) species, ((Porph)-Fe(t-BuNC)2)ClO4, Porph = OEP, TPP, were synthesized and characterized. Consistent with the predicted effect from the strong pi-acceptor character of the axial tert-butyl isocyanide ligands, the X-ray structure of the complex revealed that the porphyrinate ring is strongly ruffled.